Re: 'keep trap of' for 'keep track of'

If you don’t keep trap of things, you are apt to lose trap of them:
“I had a couple different back straps and trigger guards and I must admit, at this point I have lost trap of what tparts came with what.”
(from a firearms related forum – maybe trap shooting has something to do with it?)

Which leads me to think of another trap/track swap:
“We then went track shooting, where the clay pigeon launcher shot the projectiles in various directions.”